The Global Stratotype Section and Point (GSSP) of the Silurian/Devonian boundary, Lower Devonian Series Lochkovian Stage was formally placed in 1977 at Klonk, Czech Republic, first appearance graptolite Uncinatograptus uniformis (Přibyl). However, since then, correlation this limit has been often hampered carbonate facies where graptolites are uncommon or totally absent. A large calcareous depo...

The article considers an approach to the reconstruction of bioproductivity Palaeozoic pelagic ecosystems based on numeric modelling carbon isotope fractionation. model uses information dioxide content in atmosphere, water temperature, and isotopic composition carbonates conodont elements. developed is tested material from Upper Devonian — Lower Carboniferous northern Cis-Urals (successions carb...